Objective To analyze the prevalence and years lived with disability(YLD) from dental caries among children and adolescents and the time trends over the past two decades in Sichuan province,the largest province in west China.Methods Based on the Global Burden of Disease Study 2015(GBD2015),which systematically assessed the epidemiological characteristics of major diseases and their transitions by country and region from 1990 to 2015,we extracted the estimated results for China.We then used the Bayesian meta-regression method to estimate the sex-and age-specific prevalences and YLDs from dental caries among children and adolescents under 15 years old in Sichuan province and compared them with global and national indicators for the same period.Results In 2015,there were almost 6 million cases of dental caries in children and adolescents(aged<15 years) in Sichuan province,accounting for 6% of the total cases in China.For children under 5 years,the prevalence of deciduous caries was 55.9%,and the YLDs value was 10.8 per 100,000,while it was 24.3% and 5.1 per 100,000 respectively among 5- to 14-year-olds;for those aged 5 to 14 years,the prevalence of permanent caries was 21.5%,and the YLDs value was 11.5 per 100,000.From 1990 to 2015,the prevalence of dental caries for children under 5 years increased substantially,by 16.2%,and the YLDs increased by 8.7%.Among those aged 5 to 14 years,the prevalence increased and the YLDs decreased.Conclusion Dental caries remains a huge health burden in Western China.In contrast to the global and national data,the trend has increased rapidly over the past 25 years in this region.This work provides suggestions for the prevention and control for oral health in China with the policy of two-child. Objective To analyze the prevalence and years lived with disability (YLD) from dental caries among children and adolescents and the time trends over the past two decades in Sichuan province, the largest province in west China. Methods Based on the Global Burden of Disease Study 2015 (GBD2015), which systematically assessed the epidemiological characteristics of major diseases and their transitions by country and region from 1990 to 2015, we extracted the estimated results for China. We then used the Bayesian meta-regression method to estimate the sex-and age- specific prevalences and YLDs from dental caries among children and adolescents under 15 years old in Sichuan province and compared them with global and national indicators for the same period. Results in 2015, there were almost 6 million cases of dental caries in children and adolescents (aged <15 years) in Sichuan province, accounting for 6% of the total cases in China. For children under 5 years, the prevalence of deciduous cars was 55.9%, a nd the YLDs value was 10.8 per 100,000, while it was 24.3% and 5.1 per 100,000 respectively among 5- to 14-year-olds; for those aged 5 to 14 years, the prevalence of permanent caries was 21.5%, and the YLDs value was 11.5 per 100,000. From 1990 to 2015, the prevalence of dental caries for children under 5 years increased substantially, by 16.2%, and the YLDs increased by 8.7% .Among those aged 5 to 14 years, the prevalence increased and the YLDs decreased .Conclusion Dental caries remains a huge health burden in Western China.In contrast to the global and national data, the trend has increased rapidly over the past 25 years in this region. This work offers suggestions for the prevention and control for oral health in China with the policy of two-child.